https://www.jianshu.com/p/de7bd0093c43

關於 微信小程式藍芽 分包傳送 及 多包傳送 不返回問題

關於分包傳送 20位元組分包，微信小程式支援多於20位元組傳送。但是低功耗藍芽傳輸可能會有問題，建議分包傳送

for (var i = 0;i<e.length;i+=20) {

var endLength = 0

if (i+20<e.length) {

var senddata = e

let buffer = new ArrayBuffer(20)

let dataView = new DataView(buffer)

let dataSend = [] for (var j = i; j < i + 20; j++) {

dataView.setUint8(j - i, senddata[j])

dataSend.push(dataView.getUint8(j-i)) }

console.log('多包傳送的包資料:'+dataSend)

wx.writeBLECharacteristicValue({

deviceId: app.globalData.deviceId+"",

serviceId: app.globalData.writeServicweId+'',

characteristicId: app.globalData.writeCharacteristicsId+'',

value: buffer,

success: function (res) {

console.log('多包writeBLECharacteristicValue success',res.errMsg)

},

fail: function (res) {

console.log('傳送失敗')

}

})

sleep(0.02)

}else{ //console.log(app.globalData.writeServicweId+'-----------')

var senddata = e

if (20 < e.length) {

endLength = senddata.length-i

}else{

endLength = senddata.length

}

let buffer = new ArrayBuffer(endLength)

let dataView = new DataView(buffer)

let dataSend = []

for (var j = i; j < senddata.length; j++) {

dataView.setUint8(j-i, senddata[j])

dataSend.push(dataView.getUint8(j-i))

}

console.log('最後一包或第一資料:' + dataSend)

wx.writeBLECharacteristicValue({

deviceId: app.globalData.deviceId+"",

serviceId: app.globalData.writeServicweId+'',

characteristicId: app.globalData.writeCharacteristicsId+'',

value: buffer,

success: function (res) {

console.log('一包writeBLECharacteristicValue success',res.errMsg) },

fail: function (res) {

console.log('傳送失敗')

}

})

sleep(0.02)

}

}

作者：gazyy1
連結：https://www.jianshu.com/p/de7bd0093c43
來源：簡書
簡書著作權歸作者所有，任何形式的轉載都請聯絡作者獲得授權並註明出處。